This crew member (aka Second AC, or Clapper Loader) is responsible for preparing and operating the clapper at the beginning of each take. The second AC is also responsible for loading the camera if a designated camera loader has not been appointed.
This crew member, (AKA first AC, or focus puller) is responsible for making sure that the camera stays in focus through out the duration of the shot. Often times the depth of field changes, or the object that is being shot changes position and it is the job of the first AC to make sure the focus is adjusted properly when these changes happen.
This person uses the camera under the direction of the Director of Photography. He/she is the one looking through the view finder, and operating the movement of the camera.
Film Escape 